Plumed cockscomb

Sun

Full sun; light afternoon shade can help in very hot climates, but too much shade reduces flowering.

Water

Water when the soil surface starts to dry, keeping the root zone evenly moist but never waterlogged. Containers may need daily checks in hot weather.

Soil

Fertile, well-drained soil enriched with compost; avoid heavy, persistently wet ground.

Height

0.5-3 ft (0.15-0.9 m), depending on cultivar

Spread

0.5-1.5 ft (0.15-0.45 m), depending on cultivar

Flowers

Summer to autumn, until frost; upright plumes in red, orange, yellow, pink, purple or cream.

Foliage

Pointed, oval to lance-shaped leaves, usually green; some cultivars have bronze or burgundy foliage.

Growth

Fast in warm weather

Care needed

Low

• Plant outside only after frost risk has passed and the soil has warmed.
• Water at soil level when the surface begins to dry; avoid leaving pots standing in water.
• Mix compost into poor soil before planting, but avoid heavy nitrogen feeding, which encourages leaves rather than flowers.
• Feed container plants with a balanced liquid fertiliser at the label rate during active growth.
• Apply a thin mulch after the soil warms, keeping it clear of the stems.
• Stake tall cultivars in exposed positions before their flower heads become heavy.

Pruning. Pinch young plants once, before flower buds develop, if you want bushier growth; leave them unpinched for larger central plumes. Cut faded flower stems back to a healthy leaf joint, and remove plants after frost kills them.

Early spring

Sow indoors about 6-8 weeks before your expected last frost, keeping the seed compost around 21-24°C.

Late spring

Harden seedlings off gradually, then plant out after frost risk has passed and nights are reliably mild.

Early summer

Mulch warm soil, pinch young plants if branching is wanted, and install supports for tall cultivars.

Summer

Check moisture regularly, feed container plants and remove faded flower heads.

Late summer

Cut fully coloured plumes for fresh arrangements or hang them upside down in a dry, airy place for drying.

Autumn

Save seed from open-pollinated plants if wanted, then clear plants when cold weather kills them; hybrids may not come true from seed.

• Plant compact cultivars along sunny border edges for repeated blocks of bright colour.
• Combine with zinnias, marigolds and salvias in a hot-coloured summer border.
• Use dwarf cultivars in containers with plants that share their need for warmth and good drainage.
• Grow taller cultivars in cutting beds for fresh and dried flower arrangements.

Garden styles it suits: Hot border, Tropical, Cottage garden, Potager (kitchen garden), Urban city garden and Small-space.

Plant it with: Zinnia, French marigold, Mealycup sage, Globe amaranth, Annual vinca and Sweet potato vine.

Wildlife: The small flowers within the plumes can attract bees and other insects, although visits vary between cultivars. Seed left to mature may be taken by small birds.

• Root or stem rot in wet soil: improve drainage, reduce watering and remove badly affected plants.
• Aphids on young shoots: wash off small colonies with water; use insecticidal soap if necessary, following the label.
• Spider mites in hot, dry conditions: look for fine webbing and speckled leaves, rinse leaf undersides and avoid letting plants dry out severely.
• Poor growth or yellowing after early planting: cold soil checks growth; wait for sustained warmth and protect plants from chilly nights.

Not known to be toxic to cats, dogs, horses or people. No part is recognised as poisonous, though eating large amounts of any garden plant may cause digestive upset; do not eat plants treated with ornamental pesticides.

Where it spreads. The species can self-seed freely in warm, frost-free climates and occurs as a weed in tropical northern Australia. Remove spent plumes before seed ripens where unwanted seedlings are a concern.

• Crested cockscomb (Celosia argentea Cristata Group)

  Its flower heads form broad, folded, brain-like crests rather than upright feathery plumes.

• Wheat celosia (Celosia spicata)

  It has narrower, cylindrical flower spikes resembling wheat ears, rather than broad, branching plumes.

• Prince's feather (Amaranthus hypochondriacus)

  Usually a larger plant with coarser leaves and dense, grain-like flower clusters rather than the fine, feathery texture of plume celosia.

Celosia comes from the Greek word for burning, referring to the flame-like flowers, while argentea means silvery and refers to the pale flower heads of the wild species.

Propagation. Grow from seed in warmth, covering it only lightly with fine seed compost. Use individual cells or small pots and transplant while young to minimise root disturbance; purchased seed is more reliable than saved seed for maintaining a cultivar's colour and form.

Accepted botanical name

Celosia argentea

In the US and Canada

Introduced in the lower 48 states, Pacific Basin, Puerto Rico and US Virgin Islands.

Native range

Benin, Cameroon, Central African Repu, Chad, Congo, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Ghana, Guinea and Guinea-Bissau.

Measured

Average height 40 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.